It captures airborne allergens like dust, pet dander, pollen and spores. The frame is made with moisture resistant 28 point beverage board and is supported with a 30 gauge galvanized expanded metal grid. The media assembly pack is completely bonded to the frame for durability. The air filter cartridge fits the Trane/American Standard Air Cleaner model number TFM260A0AH1 and air cleaner systems requiring a 21x26x5 media.